The thread also covers the threat the X-parasites posed, as well as some of their capabilities given that the SA-X was likely a source for a portion of the X in the station.

Accolades/Accomplishments:

From Metroid Fusion

Credit to ShadowMario3

5:02

The SA-X was mimicking Samus at her full power, and at the time Samus was no match for it.

From Metroid Fusion

Credit to ShadowMario3

5:28

The SA-X has Samus’s strongest abilities, is too powerful for Samus at that state to defeat, and threatens the universe.

From Metroid Fusion

Credit to ShadowMario3

3:57

An SA-X succeeds in destroying a laboratory filled with Metroids, though it is destroyed in the process.

From Metroid Fusion

Credit to ShadowMario3

0:09

The Computer states that the Federation thinks the X-parasites have tremendous potential applications, and Samus ponders that the Federation would have no chance at containing them. Also, the Computer mentions how the Federation would take the risk to capture the SA-X, and found it to be too valuable for them to help Samus become strong enough to defeat it. Samus then ponders how the X mimic form, knowledge, and power, as well as how they would spread across the universe and end galactic civilization if they had access to interstellar travel.

“Along the way, collect classic power-ups like the Morph Ball, Screw Attack, and Wave Beam. All these skills will be useful when you encounter the SA-X, an unstoppable X mimicking Samus, which is on the loose and could be just around the corner…”

From Nintendo – Official Site

The SA-X is described as unstoppable.

Durability/Defenses:

From Metroid Fusion

Credit to ShadowMario3

1:45

The SA-X’s original X form was unable to be harmed by Samus’s missiles after its host was destroyed.

From Metroid Fusion

Credit to ShadowMario3

6:26

Samus was unable to damage the SA-X when she had the charge beam, super missiles, the speed booster, and bombs, though the computer thought the plasma beam could work. Later, it is revealed that charged plasma beam shots and screw attack hits can deal damage to the SA-X.

From Metroid Fusion

Credit to ShadowMario3

1:43

The SA-X’s Core-X form was unharmed by the Screw Attack.

1:50

A diffusion missile was deflected by the Core-X when it doesn’t contact the open eye.

From Metroid Fusion

Credit to YoshiCrazyPrime

1:51

The SA-X uses the screw attack to deflect a diffusion missile.

2:07

The SA-X uses the screw attack to deflect a charged plasma beam shot.

Firepower:

From Metroid Fusion

Credit to ShadowMario3

2:21, 3:18

The SA-X’s super missiles can destroy walls and hatches, and apparently cause electrical interference to shut down the elevator.

From Metroid Fusion

Credit to ShadowMario3

4:08

The SA-X’s weaponry causes the self-destruct protocol of the restricted laboratory to activate.

From Metroid Fusion

Credit to ShadowMario3

4:48

An unexplained explosion rocked the B.S.L. This explosion is revealed to be caused by the X:

From Metroid Fusion

Credit to ShadowMario3

4:49

The explosion is revealed to have been from the SA-X’s power bomb.

From Metroid Fusion

Credit to biospark

18:39

Samus gets frozen by the SA-X’s ice beam, and the super missile deals an additional 100 damage to the Fusion Suit. The SA-X’s beam goes through Samus, most likely due to the presence of the plasma beam.

34:21

The SA-X’s power bomb destroys a wall and floor.

From Metroid Fusion

Credit to ShadowMario3

7:10

The SA-X fires through the floor, showing the wave beam’s capabilities.

From Metroid Fusion

Credit to ShadowMario3

1:59

The SA-X’s Core-X form fires through Samus.

3:38

The SA-X injures the Omega Metroid with its beam, despite Samus’s weapons having been ineffective against the Metroid.

From Metroid Fusion

Credit to YoshiCrazyPrime

1:16

The SA-X attacks Samus with the screw attack.

Maneuverability:

From Metroid Fusion

Credit to ShadowMario3

2:00

The SA-X’s X form escapes from Samus through a wall.

From Metroid Fusion

Credit to YoshiCrazyPrime

1:14

The SA-X uses the space jump to fly towards Samus.

Intelligence:

From Metroid Fusion

Credit to ShadowMario3

0:22

The SA-X was sabotaging Samus’s attempts to regain her abilities.

From Metroid Fusion

Credit to ShadowMario3

6:22

The computer confirms that the X’s attempts to sabotage Samus seem purposeful.

From Metroid Fusion

Credit to ShadowMario3

5:39

The X hacked into the Main Boiler to try and destroy the station.

From Metroid Fusion

Credit to ShadowMario3

9:15

The SA-X was hunting Samus in Sector 6.

From Metroid Fusion

Credit to ShadowMario3

5:00

One SA-X hunted down the Metroids and ensured their destruction.

Infectious Capabilities:

“Properties of X-Parasites

X infect other creatures and grow in the nervous systems of these host organisms. Even more worrisome is their ability to control and assume the appearance and behavior of other life-forms through mimesis, a process of infection and replication. The X must somehow be capable of assuming the memories and genetic information of their hosts.”

From Metroid Fusion Instruction Booklet

Credit to Metroid Database

The X can replicate inside hosts and control or mimic their victims.

From Metroid Fusion

Credit to ShadowMario3

1:45

The SA-X’s original X form was able to infect Samus through the Power Suit.

2:22

The X causes Samus to slip into a coma.

Development/Duplication:

From Metroid Fusion

Credit to ShadowMario3

3:24

The X invaded atmospheric stabilizers and were reproducing rapidly.

From Metroid Fusion

Credit to ShadowMario3

3:42

The X were growing stronger and resisting Samus’s weaponry.

From Metroid Fusion

Credit to ShadowMario3

5:03

The SA-X had duplicated, leaving at least 10 remaining SA-X after one was destroyed with the Restricted Laboratory.

6:33

An X-parasite duplicates rapidly.

From Metroid Fusion

Credit to ShadowMario3

1:18

The SA-X transforms into a giant monster.

From Metroid Fusion

Credit to ShadowMario3

3:38

The SA-X regenerates from its exposed X form.

From Metroid Fusion

Credit to ShadowMario3

2:40, 6:16

The X can download data organically.

Combative Ability:

From Metroid Fusion

Credit to ShadowMario3

3:38

The SA-X regenerates from its exposed X form and repels the Omega Metroid for a small amount of time.

Physical Strength:

From Metroid Fusion

Credit to ShadowMario3

7:10

The SA-X thawed itself much quicker than other creatures Samus is capable of freezing.